package com.ws.singleton;

/*
单例模式的懒汉式实现

 */
public class SingleTonTest2 {
    public static void main(String[] args) {
        Order order1 = Order.getInstance();
        Order order2 = Order.getInstance();
        System.out.println(order1 == order2);
    }
}

class Order {

    //1.私有化类的构造器
    private Order() {}

    //2.声明当前类对象，没有初始化
    //4.此方法也必须声明为static的
    private static Order instance = null;

    //3.声明public、static的返回当前类对象的方法
    public static Order getInstance() {
        if (instance == null)
        instance = new Order();

        return instance;
    }
}

